Draft-controlling mechanism for smoke-consuming furnaces.



E. R. GREENE.

DRAFT CONTROLLING MECHANISM FOR SMOKE CONSUMING FURNACES.

' APPucATmN FILED JAN-25.1915.

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Aiiarney Patented Oct. 19, 1915.

E. R. GREENE.

DRAFT CONTROLLING MECHANISM FOR SMOKE CONSUMING FURNACES. 1 APPLICATIONFILED JAN.25. 1915.

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ELI-E., GEEE1 IE, 0E EEs MoIivEs, IOWAL;

To all-whom it may concern;

Be it that I, ELI R. GREENE, citizen ofthe United States of America,"and resident'of Des Moines, Polk county, 'Iowa, have invented a new anduseful Draft Controll ing' Mechanism for Smoke-Consuming Furnaces, ofwhich the following is a specification The object of this invention isto provide means for mechanically controlling the draft devices in aforced-draft smoke-consuming furnace.

A further object of this invention is to provide an improvedconstruction whereby a forced draft of air is admitted to a fur-r naceimmediately after coaling, to the end of consuming the smoke and gasesincident to the young fire, and of mechanically and graduallyopening-the regularlower draftand then 'shutting olf the forced draftfor the normalcont'r'ol of the fire.

A further object of this invention is to;

provide means for controlling mechanically the forced and regular draftsof a furnace according to the condition of the fire;

hereinafter setv forth, pointed out in my claims and illustrated by theaccompanying I I I laterally of the furnace the streams ofisteam.Figurel a front elevation of alp'ortion of a furnace equipped With myimprove I II I much draft from below during'the consump-' ments andshowing the'd'raft doors in closed position. Fig. 2 is a similar vievvillusanism employed. Fig. 5 is a sectional eleva tionat rightanglesto'Fig4; Fi 6 1 -hsectional elevation of theforced draft devices.

In the construction and application of the improvements as shown thenumeral 10 designates gen rally a boiler furnace of any suitable Iconstruction, formed With fuel 'doors'l'l, 12 anddraft doors13,14 th rebeneath. 'Anair pipe 15 is mountedtransversely across thefront'of andWithinthe furnace" l0 and isformed With a plurality of branches ornipples 16 opening therefrom and direct'ed rearwardlyf Within the firebox of the furnace above the fuel doorsll, 12.

The air pipe 15'is closed at its inner end and leads from some suitablepaint outside the My invention consistsin the constructiomf arrangementand combination of elements} andair escaping therefrom.

DRAFT-CONTROL ING MEonAN i'sMi oE 'sMoKE-consnnme EnRivAcEs. v

I Specification of Letters Patent. I Patented @4313, 1Q, 1915,Application fiiea Januaryi25,1915; Serial No. 4,289." f i v pipereceives a supply of atmospheric air.

A pressure pipe 18 leads from a source of steam or compressedairsupply-and traverses the front of the furnace 10' parallel With andadjacent to the air pipe 15 and on the opposite side thereof from thenipples branches or: j'ets- 19 passing rearWardly through the air pipe15 and projecting Within the respective nipples 16. At times steam orcompressed air is permitted to flow through the pressure pipe, by,opening a valve 20'therein, andto pass out through the jets 19, thuscreating aforced draft of air through the pipe 15 andnipples 16 tot theend of furnishing anabnormal supply of oxygen to the fire on. a planeimmediately fuel has been added to the fire, to the, end of 16. The"steam pipe 18 is formed With beneath the boiler of the furnace 10. Thisis especially desirable immediately after consuming the I gases releasedfrom such fresh fuel and creat ng a combust on e13 such gases high up inthe fire box and im' mediately beneath the boiler, -Where it will.

be. mosteffective. The .ext'remities of the jets 19 and nipples 16preferably are fiat-l tened or spread horizontally to distributef It'is' desirable notto g ve the;

tion of the gases as above described, ;as

throughthe regular draft doors13', 14:, but to gradually open. suchdoors and" increase, "the draft from belovv as such consumptienprogresses, until said draft doors areffully openedv and furnishingdraft to. the fire in naled a crank shaft 22,projecting at both endsfrom said casing. On the rear end portion of the crank shaft 22 is fixedand} Wound a 'leafspring 23 having its opposite end secured by a bolt 24to said casing.

cylinderf2 5 is mounted Within the casing 21,:

and a piston 26 is adapted for rectilinear); reciprocation thereinand'has its stem piv- I otally connected to t he throwofthe crank w? Thea i 1 is a a s tq c n-y "min-a quant1ty---'ofoi1 27 or othersultabiefluid adapted to be drawn into. the cylinder through a check valve 28 byupward move ment of the piston 26 and to be discharged from saidcylinder through a suitable valve 29 by downward movement of saidpiston,

. to the end of steadying and governing the action of the shaft 22 andparts connected thereto. A pinion 30 is fixed to the for wardlyprojecting end portion of the crank shaft 22 and is in mesh with andadapted to drive a pinion 31 fixed to a countershaft 31 journaled forrotation in the casing 21. A crank handle or lever 32 is also fixed tothe forwardly projecting end portion of the crank shaft 22 and isadapted for manipulation to rotate the said shaft to set position andwind the spring 23 thereon. A shaft 33 is journaled for rotation in andprojects throughthe casing 21 and a pinion 34 is fixed to the forwardlyprojecting end portion thereof and is in mesh with and adapted to bedriven by the pinion 31. The rearwardly projecting end portion of theshaft 33 is suitably secured to and adapted to operate the valve 20 ofthe pressure pipe 18.

The countershaft 31 is also formed with a crank arm 35 on its forwardlyprojecting end portion, beyond the pinion 31.

Bearings 36, 37. are fixed to the front wall or plate of the furnace 10and a shaft 38 is mounted for rotation or rotary oscillation v therein,in upright position. The upright said pitman 40.

shaft 38 is formed with a crank arm 39, projecting rearwardly, on itsupper end portion, to which is pivotally connected one end portion of apitman or connecting rod 40 extending transversely across the front ofthe furnace toward the casing 21. The pitman 40 is removablyconnected,as by an upstanding hooked arm 41, to the crank arm 35 of thecountershaft 31 and said hooked arm 41 preferably is adjustably securedto In this instance I have shown the hooked arm 41 as being apertured tofit loosely the pitman 40, which is threaded and has nuts 42, 43 screwedthereon on opposite sides of said arm. The pintle rods 44, 45 of thedraft doors 13, 14 are secured to said'doors by hinge members 46' andare mounted loosely in hinge'members 47 carried by the furnace plate.The pintle rods 44, 45 are formed with rearwardly projecting cranks 48,49 on their upper ends. Oppositely extending arms 50, 51 are fixed tothe lower end portion of the upright shaft 38 and are formed with.upstanding studs 52, 53 on their ends, to which are pivotally connectedthe inner endportions of connecting rods 54, 55 respectively. The

connecting arms 54, 55 extend in opposite (1111301210118 transversely ofthe furnace and are pivotally connected at their outer ends to thecranks 48, 49 respectively. Thus thedraft doors 13, 14, which are hingedat their outer margins, are connected to the countershaft 33 and areadapted to be swung to open position by unwinding of the spring 23.

In practical operation, when it is desired to supply fresh fuel throughthe doors 11, 12, the draft doors 13, 14 are first moved to closed ornearly closed position. The handle 32 is moved to upright position,which results in winding the spring 23 and raising the piston 26 in thecylinder 25. This action also results in opening the valve 20 andadmitting steam to the pipe 18 and jets 19, whence it issues through thenipples 16, to the end of setting up a forced draft of air through thepipe 15 and said nipples. This forced draft supplies an abnormalquantity of oxygen to the young fire to the end of consuming the smokeand gases released from the fresh fuel when first heated, and alsoforcibly breaks up such smoke and gases and mingles oxygen therewith,and the location of the nipples 16 immediately beneath the boiler of thefurnace results in placing this combustion where it will be mostefiective. As soon as the handle 32 is released manually the spring 23begins to unwind, causing a clockwise rotation of the crank shaft 22 anda similar rotation, through the gears 30, 31 and 34, of the shaft 33,and an opposite rotation of the countershaft 31 This movement of theparts is retarded, steadied and governed by the resistance of the fluid27 in the cylinder 25 to the descent of the piston 26. As the crank 35moves in the opposite direction to the handle 32, the first result ofsuch movement is a movement to the left of the pitman 40, and then aftersaid crank has passed the horizontal, a movement to the right. Theresult of the first part of this movement is a counter clockwiseoscillation of the upright shaft 38 and a consequent reciprocatorymovement of the connecting rods 54, 55 away from the median line of thedevice, to the end of closing or holding closed the draft doors 13,14,so that the young fire will not get too much draft from beneath, whichwould interefere with the thorough consumption of the gases as abovedescribed. After the crank 35 has passed the horizontal position,however, in its downward movement, these movements are reversed, and thedraft doors 13, 14 are gradually moved to open position as shown inFigs. 2 and 3. When the throw of the crank shaft 22 has completed a halfrevolution, approximately, it engages the countershaft 31 and is held,thus furnishing a positive stop for the parts while the spring 23 isstill exerting its force, whereupon all movement of the parts ceases.

As the shaft 33 is rotated through the action of the pinions 30, 31 and34 it causes a gradual closing movement of the valve 20, and as thelatter pinion is preferably just half the size of the pinion 30, saidshaft completes approximately a whole revolution,

and acts to completely close said valveat the time the parts havereached their ultimate positions as above described, whereupon the flowof steam or compressed air is stopped and the forced draft discontinued.Thereafter the fire receives the desired draft from manually. The hookedarm 41 may be dis-.

connected from the crank -until such time as the controlling mechanismis again deisglired for use, upon adding fresh fuel to the Thismechanism controls the drafts, both the lower draft and the forceddraft, and the furnace requires no attention from the fireman after theaddition of the fuel and setting of the device as above described.

It is obvious that the device may be adapted for use on either side ofthe furnace, and that various modifications of the various cranks, armsand connecting members may be employed without departing from the spiritof my invention.

I claim as my invention 1. In a furnace having hinged bottom draftdevices and valvecontrolled forced draft devices, a motor, acountershaft mounted for rotation, driving connections between saidmotor and countershaft,connections be- 7 tween said countershaft and thevalve of said forced draft devices, an uprightshaft mounted for rotaryoscillation, said upright shaft and countershaft being formed withcranks on their adjacent ends, a pitman pivotally connecting saidcranks, said upright shaft also being formed withoppositely ex tendingarms, connecting rods pivotally connected at one end to said oppositelyextending arms, and connections between said connecting rods and saidbottom draft devices.

2. In a furnace having hinged bottom draft devices and valve-controlledforced draft devices, a motor, a countershaft mounted for rotation,driving connections between said motor and countershaft, connectionsbetween said countershaft and the valve of said forced draft devices, anupright shaft mounted for rotary oscillation, said upright shaft andcountershaft being formed with cranks on their adjacent portions, 'apitman pivotally connected at one end to the crank of said uprightshaft, an arm. adjustably secured to the opposite end portion of saidpitman and removably connected to the crank of said countershaft, andconnections Copies of this patent may be obtained for b n said uprightshaft and the bottom draft devices. 7 V

' 3. In a furnace havinghinged bottom draft devicesand valve-controlledforced draft devices, a motor, a countershaft mount ed for rotation,driving connections-between said motor and countershaft, connectionsbetween said countershaft and the valve of said forced'draft devices, anupright shaft mounted for rotary oscillation, connections between saidcountershaft and uprightv shaft, crank arms fixed to and projecting fromsaid bottom draft devices, oppositely extending arms on'saiduprightshaft, and pivotal connections between said oppositely extending armsand the crank arms of said bottom draft devices.

4:. In a furnace having bottom draft devices and valve-controlled forceddraft devices, a motor having a crank shaft, a countershaft mounted forrotation, intermeshing pinions on said countershaft and crank shaft, athird shaft mounted for rotation, a pinion fixed to the latter shaft andengaging the pinion of the countershaft, the pinion on the said thirdshaft being of materially less diameter than the pinion of the "crankshaft, connections between the third shaftand thevalve of the forceddraft devices, connections between the countershaft and the bottom draftdevices, and means for positively-stopping said crank shaft.

5. In a furnace having bottomdraft devices and valve-controlled forceddraft de vices, a casing, a crank shaft 'journaled therein, a springfixed to sald casing and .crank shaft and adapted to bewound on thelatter, a cylinder in said casing provided with anqinlet valve and anoutlet valve, a

piston mounted for reciprocation in said cylinder and connected to saldcrank shaft,

a liquid in said casing and adapted to be forced in" and out ofsaidcylinder by the action of said piston, a countershaft journaled in saidcasing, driving connections between the: crank shaft and countershaft,connectionsbetween said countershaft and the valve of the forceddraftdevices, and

connections between the countershaft and the bottom draft devices. ISigned by me at Des-Moines, Iowa, this 9". day of November, 1914.

1 ELI R. GREENE.

Witnesses:

EARL M. SINCLAIR,

IsAAc J ONES.

five cents eacli, by addressing the" Commissioner of Patents,

Washington, D. 0.

